The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 10, 2017
Filed:
Jul. 24, 2013
Jx Nippon Oil & Energy Corporation, Tokyo, JP;
Shigeki Matsui, Tokyo, JP;
Hiroya Miyamoto, Tokyo, JP;
Hiromitsu Matsuda, Tokyo, JP;
Kazuo Tagawa, Tokyo, JP;
Akira Takagi, Tokyo, JP;
Ryuichi Ueno, Tokyo, JP;
JX NIPPON OIL & ENERGY CORPORATION, Tokyo, JP;
Abstract
The present invention provides a poly(meth)acrylate-based viscosity index improver comprising a core portion and three or more arm portions, wherein each of the arm portions consists of a polymer chain comprising a structural unit represented by the following formula (1), and one end of the polymer chain is bonded to the core portion, and wherein a weight-average molecular weight Mw is 100000 or more, and a ratio of the weight-average molecular weight Mw to a number average molecular weight Mn, Mw/Mn, is 1.6 or less. [Rrepresents hydrogen or a methyl group, and Rrepresents a C1 to C36 alkyl group.]